Given that VEX is currently not providing any replacement components for the new pneumatic kits, I’d recommend all teams who purchase these kits stock up on remote fill Schrader valves from the old pneumatics kit.
If your fill valve from the new kit breaks, you can replace it with a straight or angled fitting and run a tube to this component to still be able to use your $300 kit.
This would be a great component for VEX themselves to include in the new kit.